1 //===-- runtime/stop.cpp ----------------------------------------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "stop.h"
10 #include "file.h"
11 #include "io-error.h"
12 #include "terminator.h"
13 #include "unit.h"
14 #include <cfenv>
15 #include <cstdio>
16 #include <cstdlib>
17 
18 extern "C" {
19 
20 static void DescribeIEEESignaledExceptions() {
21 #ifdef fetestexcept // a macro in some environments; omit std::
22   auto excepts{fetestexcept(FE_ALL_EXCEPT)};
23 #else
24   auto excepts{std::fetestexcept(FE_ALL_EXCEPT)};
25 #endif
26   if (excepts) {
27     std::fputs("IEEE arithmetic exceptions signaled:", stderr);
28     if (excepts & FE_DIVBYZERO) {
29       std::fputs(" DIVBYZERO", stderr);
30     }
31     if (excepts & FE_INEXACT) {
32       std::fputs(" INEXACT", stderr);
33     }
34     if (excepts & FE_INVALID) {
35       std::fputs(" INVALID", stderr);
36     }
37     if (excepts & FE_OVERFLOW) {
38       std::fputs(" OVERFLOW", stderr);
39     }
40     if (excepts & FE_UNDERFLOW) {
41       std::fputs(" UNDERFLOW", stderr);
42     }
43     std::fputc('\n', stderr);
44   }
45 }
46 
47 static void CloseAllExternalUnits(const char *why) {
48   Fortran::runtime::io::IoErrorHandler handler{why};
49   Fortran::runtime::io::ExternalFileUnit::CloseAll(handler);
50 }
51 
52 [[noreturn]] void RTNAME(StopStatement)(
53     int code, bool isErrorStop, bool quiet) {
54   CloseAllExternalUnits("STOP statement");
55   if (!quiet) {
56     std::fprintf(stderr, "Fortran %s", isErrorStop ? "ERROR STOP" : "STOP");
57     if (code != EXIT_SUCCESS) {
58       std::fprintf(stderr, ": code %d\n", code);
59     }
60     std::fputc('\n', stderr);
61     DescribeIEEESignaledExceptions();
62   }
63   std::exit(code);
64 }
65 
66 [[noreturn]] void RTNAME(StopStatementText)(
67     const char *code, bool isErrorStop, bool quiet) {
68   CloseAllExternalUnits("STOP statement");
69   if (!quiet) {
70     std::fprintf(
71         stderr, "Fortran %s: %s\n", isErrorStop ? "ERROR STOP" : "STOP", code);
72     DescribeIEEESignaledExceptions();
73   }
74   std::exit(EXIT_FAILURE);
75 }
76 
77 void RTNAME(PauseStatement)() {
78   if (Fortran::runtime::io::IsATerminal(0)) {
79     Fortran::runtime::io::IoErrorHandler handler{"PAUSE statement"};
80     Fortran::runtime::io::ExternalFileUnit::FlushAll(handler);
81     std::fputs("Fortran PAUSE: hit RETURN to continue:", stderr);
82     std::fflush(nullptr);
83     if (std::fgetc(stdin) == EOF) {
84       CloseAllExternalUnits("PAUSE statement");
85       std::exit(EXIT_SUCCESS);
86     }
87   }
88 }
89 
90 [[noreturn]] void RTNAME(FailImageStatement)() {
91   Fortran::runtime::NotifyOtherImagesOfFailImageStatement();
92   CloseAllExternalUnits("FAIL IMAGE statement");
93   std::exit(EXIT_FAILURE);
94 }
95 
96 [[noreturn]] void RTNAME(ProgramEndStatement)() {
97   CloseAllExternalUnits("END statement");
98   std::exit(EXIT_SUCCESS);
99 }
100 }
101